A related effect was measured by economist Jennifer Brown of the University of California, Berkeley who found that other golfers played worse when competing against Woods than when he was not in the tournament. The scores of highly skilled (exempt) golfers are nearly one stroke higher when playing against Woods. This effect was larger when he was on winning streaks and disappeared during his well-publicized slump in 2003–04. Brown explains the results by noting that competitors of similar skill can hope to win by increasing their level of effort, but that, when facing a "superstar" competitor, extra exertion does not significantly raise one's level of winning while increasing risk of injury or exhaustion, leading to reduced effort.[201]
Many courses in the PGA Tour rotation (including Major Championship sites like Augusta National) began to add yardage to their tees in an effort to slow down long hitters like Woods, a strategy that became known as "Tiger-Proofing". Woods himself welcomed the change as he believes adding yardage to the course does not affect his ability to win
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